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       gpiv_vorty  -  Calculates  the differential quantities vorticity, shear
       strain and normal strain from PIV data.


       gpiv_vorty [-d N] [-h | --help] [-p | --print] [-g | --g] [--no_g ] [-v
       | --version] [filename] < stdin > stdout


       gpiv_vorty calculates the differential quantities like vorticity, shear
       strain and normal strain from PIV data. You  can  choose  from  several
       differential   schemes:   central   differentiation,   least   squares,
       Richardson extrapolation and  circulation  method.  Circulation  method
       only  allows  to  calculate vorticity, but no strain. The output can be
       generated as ASCII data containing four  columns  or  as  GNUPlot  Data
       format that allows to view/print the data as contour plots.

       The configuration parameters (containing the POST key) may be overruled
       by the command line options, as explained below.


       -d N   Differential type to be used: central  difference  (N=0),  least
              squares   (N=1),  Richardson  interpolation  (N=2),  circulation
              method (N=3)

       -h | --help
              On-line help

       -p | --print
              Print parameters, command line options and eventually used input
              and  output  filenames  to  stdout.  The  output  is  identic of
              filename.par, in case filename is used.

       -g     Show contour plot of the output with gnuplot.

       --no_g Suppresses to show contour plot of the output with gnuplot.

       -v | --version
              Print  version  information  on  standard  output,   then   exit

              Input PIV data file. Overrides stdin and stdout. The output will
              be  written  to   filename.vor.   Parameters   are   stored   in
              filename.par and may be used for future use by including them in




       Gerber Van der Graaf

                                8 November 2006